I work exclusively with dichroic glass and the glass coatings are not something that can be made on your own. The piece of glass in the picture looks to be silver which changes to aqua. It is double thickness and appears to be on a black background.
When you work with glass like this piece you can leave the surface as it is or cap it with clear glass. I like the rich patterns and textures of all the new glass, so I try to maintain the texture. If you decide to cap it, make sure you use COE 90 which is what Uroboros is.
I don’t know if you can get Dichro Slide in Iran. It is dichroic coated paper which can be used on any glass but should be capped with clear glass.